181620642 has 64 divisors (see below), whose sum is σ = 432463104. Its totient is φ = 49766400.

The previous prime is 181620629. The next prime is 181620653. The reversal of 181620642 is 246026181.

181620642 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112642 + ... + 114242.

It is an arithmetic number, because the mean of its divisors is an integer number (6757236).

Almost surely, 2^181620642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181620642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216231552).

181620642 is an abundant number, since it is smaller than the sum of its proper divisors (250842462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181620642 is a wasteful number, since it uses less digits than its factorization.

181620642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1723.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 181620642 is about 13476.6702860907. The cubic root of 181620642 is about 566.3110931165.

The spelling of 181620642 in words is "one hundred eighty-one million, six hundred twenty thousand, six hundred forty-two".